sort by Rank | Alpha
| Possible Meanings | Rank |
| College of Southern Idaho (Twin Falls, ID) | *** |
| Carolina Open Source Initiative | *** |
| Clarkson Open Source Institute | *** |
| Client Oriented Scale of Improvement | *** |
| Center for Open Source Investigation | *** |
| Chemoinformatics Open Source Initiative | *** |
| Computer Outsourcing Services Inc | *** |
| Center for Open Source Innovation | *** |
| Centre for Oil Sands Innovation | *** |
| consumer-oriented, service initiated | ** |
| Crying Or Sleeping Infants | ** |
| Centera Open Source Initiative | ** |
| Center for Optical Sensing and Imaging | ** |
| Centric Open Source Initiative | ** |
| Common Operating System Interface | ** |
| COLLEGE OF SOUTHERN IDAHO | ** |
| Coastal Optical Systems Inc | ** |
| Ctr of Science Industry | ** |
| Columbus Ohio Science Institute | ** |
| Chicken of the Sea International | ** |
| Client Orientated Scale of Improvement | ** |
| Centre for Opera in Sulmona Italy | ** |
| Centre for Organisational and Social Informatics | ** |
| Collaboration of Schools and Industry | ** |
| Central Ohio Science Institute | ** |
| Centre for Organic Seed Information | * |
| Chamber Orchestra of St Ives | * |
| Commission on Systemic Interoperability | * |
| Center of Science Institute | * |
| Cavaleri Ottolenghi Scientific Institut | * |
| Center for Orthopedic Surgery Inc | * |